Compilare: main.cpp: In function 'int RaisePhi(int, std::__cxx11::string, int)': main.cpp:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < b.length();++i) ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:9: warning: unused variable 't' [-Wunused-variable] int t, a, mod; ^ main.cpp:64:12: warning: unused variable 'a' [-Wunused-variable] int t, a, mod; ^ main.cpp:64:15: warning: unused variable 'mod' [-Wunused-variable] int t, a, mod; ^~~